ffmpeg过滤视频，剔除音频的操作

ffprobe -v quiet -print_format json -show_format -show_streams 1.mp4

{
    "streams": [
        {
            "index": 0,
            "codec_name": "aac",
            "codec_long_name": "AAC (Advanced Audio Coding)",
            "profile": "LC",
            "codec_type": "audio",
            "codec_time_base": "1/44100",
            "codec_tag_string": "mp4a",
            "codec_tag": "0x6134706d",
            "sample_fmt": "fltp",
            "sample_rate": "44100",
            "channels": 2,
            "channel_layout": "stereo",
            "bits_per_sample": 0,
            "r_frame_rate": "0/0",
            "avg_frame_rate": "0/0",
            "time_base": "1/44100",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 8002562,
            "duration": "181.463991",
            "bit_rate": "48559",
            "max_bit_rate": "48559",
            "nb_frames": "7816",
            "disposition": {
                "default": 1,
                "dub": 0,
                "original": 0,
                "comment": 0,
                "lyrics": 0,
                "karaoke": 0,
                "forced": 0,
                "hearing_impaired": 0,
                "visual_impaired": 0,
                "clean_effects": 0,
                "attached_pic": 0,
                "timed_thumbnails": 0
            },
            "tags": {
                "language": "und",
                "handler_name": "SoundHandler"
            }
        },
        {
            "index": 1,
            "codec_name": "h264",
            "codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
            "profile": "Main",
            "codec_type": "video",
            "codec_time_base": "27197/308700",
            "codec_tag_string": "avc1",
            "codec_tag": "0x31637661",
            "width": 720,
            "height": 960,
            "coded_width": 720,
            "coded_height": 960,
            "has_b_frames": 1,
            "pix_fmt": "yuvj420p",
            "level": 31,
            "color_range": "pc",
            "color_space": "smpte170m",
            "color_transfer": "bt709",
            "color_primaries": "smpte170m",
            "chroma_location": "left",
            "refs": 1,
            "is_avc": "true",
            "nal_length_size": "4",
            "r_frame_rate": "60/1",
            "avg_frame_rate": "154350/27197",
            "time_base": "1/618000",
            "start_pts": 0,
            "start_time": "0.000000",
            "duration_ts": 112052052,
            "duration": "181.314000",
            "bit_rate": "94498",
            "bits_per_raw_sample": "8",
            "nb_frames": "1029",
            "disposition": {
                "default": 1,
                "dub": 0,
                "original": 0,
                "comment": 0,
                "lyrics": 0,
                "karaoke": 0,
                "forced": 0,
                "hearing_impaired": 0,
                "visual_impaired": 0,
                "clean_effects": 0,
                "attached_pic": 0,
                "timed_thumbnails": 0
            },
            "tags": {
                "language": "und",
                "handler_name": "VideoHandler"
            }
        }
    ],
    "format": {
        "filename": "1.mp4",
        "nb_streams": 2,
        "nb_programs": 0,
        "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
        "format_long_name": "QuickTime / MOV",
        "start_time": "0.000000",
        "duration": "181.488000",
        "size": "3303955",
        "bit_rate": "145638",
        "probe_score": 100,
        "tags": {
            "major_brand": "isom",
            "minor_version": "512",
            "compatible_brands": "isomiso2avc1mp41",
            "encoder": "Lavf57.58.101"
        }
    }
}

static function filter_record_videos(&$record_videos)
{
    if(count($record_videos)>0){
        foreach ($record_videos as $k=>$record_video){
            $shell_command = "ffprobe -v quiet -print_format json -show_format -show_streams $record_video";
            $command_json = shell_exec($shell_command);

            $video_info = json_decode($command_json,true);
            if(isset($video_info['streams']) && count($video_info['streams']) == 1 && $video_info['streams'][0]['codec_type'] == 'audio'){
                SimpleLog::GetInstance()->Error('video_have_voice_only:'.json_encode($record_video));
                unset($record_videos[$k]);
            }
        }
    }
}